Taper attachment for sawmill-carriage blocks



"r. w. JOHNSON.

TAPER ATTACHMENT FOR SAWMILL CA RRIAGE BLOCKS.

APPLICATION FILED AUGJO. I918.

I. W. JOHNSON.

TAPER ATTACHMENT FOR SAWMILL CARRIAGE BLOCKS.

APPLICATION FILED Aue.1o, 1918.

1,383,544. Patented July 5, 1921.

2 SHEETSSHEET 2.

s i H z I! i N Q Q Gum,

* UNITED STATES- PATENT OFFICE.

IRVIN W. JOHNSONQOF COSMOPOLIS, WASHINGTON.

Specification of Letters Patent.

Patented July 5, 1921.

Application filed August'lo, 1918. Serial No. 249,237.

To all whom it may concern:

Be it known that I, IRVIN W. JOHNSON, a citizen of the United States, residing at Cosmopolis, in the county of Grays Harbor and State of Washington, have invented certain new and useful Improvements in Taper Attachments for Sawmill-Carriage Blocks, of which the following is a specification, reference being had to the accompanying drawings.

his invention relates to carriage block attachments for saw-mills, and particularly to means whereby the log to be sawed may be adjusted to an inclination with the plane of the saw, so that logs maybe tapered from 2 to 8 inches to get a straight grain of. the timber, the device being particularly adapted for sawing spruce logs, Where every clear log must be tapered.

The general object of the invention is to provide a very simple means to this end which may be applied to any ordinary saw-mill carriage block or knee and so constructed that the logmay be adjusted very quickly and yet have sufficient support for heavy logs.

A further object is to provide a device of this character including a sliding abutment or block operating within the carriage block or knee and operatively connected to a lever whereby it maybe shifted longitudinally, and in this connectionprovide a pawl for holding the slidingblock from reverse movement after it is readily disengaged from the sliding block to permit it to be pulled back when desired.

A further objectfis'to provide a device of this character which will permit the use of the ordinary hook dog and lever and the usual speed dog and-lever, if desired. I

"Other objects will appear in the course of the following description.

' My invention is illustrated in the accompanying drawings, wherein P Figure l is a side elevation of a portion of a saw-mill carriage and carriage block I or knee with my taperattachment applied thereto;

' Fig. 2 is a vertical longitudinal sectional view of the construction illustrated in Fig. 1;

Fig. 3 is a vertical transverse section on the line 33 of Fig. 1;

' Fig. 4 is a fragmentary section line H of Fig. 3; and

F ig. 5 is a side elevation of the knee or on the hasbeen adjusted which pawl connect-ed an arm 28 and to this 7 carriage block showing the countersunk recess for the bearing of the pawl shaft.

Referring to these drawings, 10 designates the usual connected beams or rails, upon which the knee or carriage block 11 is adapted to slide. The base 12 of this block is illustrated as provided with the laterally extending overhanging flanges l3 engaging with the flanges of the rails upon which the carriage block slides. The carriage block is also provided with its medially disposed screw-threaded extension 14 to receive the usual adjusting screw 15. All of these parts are old and well known and require no further description.

he carriage block or knee 11 is formed with the upwardly extending spaced supporting walls 16 and 17, formed at their upper ends with the inwardly extending ribs 18. Operating between the upper ends of these walls is a steel slide 19 having its lateral faces grooved as at 20 .to. receive the ribs 18. upper edge of the wall 17 and above the upper edge of the wall 16, and then extends laterally over the upper edge of the wall 16 and downward upon the outer face of this wall as at 21. The rear edge of this overhanging portion 21 is cut-away as at 22. The under face of the sliding block 19' is provided with a teeth 23.

Extending transversely through the walls 16 and 17 below the slide 19 is a pawl shaft 24 having mounted thereon and preferably cast therewith the pawl 25, adapted to engage with the ratchet teeth 23. The shaft 24 extends out through bearings 26 in the walls 16 and 17 and at one end the shaft is provided with a spring 27, which is coiled around the shaft, has one end connected thereto and the other end to the corresponding bearing 26, this spring acting to rotate the shaft 24 to carry the pawl 25 into enplurality of ratchet gagement with the ratchet teeth and to hold it thereon.

To the opposite end of the shaft 24 is arm there is connected a rod 29 having a hand-hold at its upper end whereby the shaft 24 may be rocked against the force of the spring 27 to carry the pawl out of its engagement with the ratchet teeth. Bearings or bushings 26 are detachably mounted'in the walls 16 and 17 so that by removing these bushings, the

This slide extends upward to the I 30 for the shaft of the While I have not illustrated ahook dog or hook dog lever such as is ordinarily used 'with carriage blocks or'knees, yet it is to be understood that such a hook'dog andlever' will be used and that preferably a speed do and corresponding lever will be used. I

, have not illustrated these devices, however,

as they are-well known and form no part of I have illustrated the walls being provided with a bearing hook dog lever, and as with a bearing 31 for the shaft of the speed lever, connection, and I my invention. 16 and 17 as sageway- 32 for the speed dog itself, It will be obvious, however, that this is purely illus trative and that the block may with any suitable dogs and levers for operating them and thatthe detailed construction of the taper attachment and the means for operating it may ways, without'departing from the splrit of the invention as defined in the appende claims.

For the purpose formed with an extension 33 to which lever 34 isoperatively connected, this lever being in turn connected to the base of the knee by means of a link'35 pivoted to ears As before stated I do not wish to be limited to this particular arrangement, how- I claim 3- a I 1. In a saw mill carriage mechanism, a

"base, a knee slidingly mounted on said base,

movement of the power operated meansfor shifting said knee longitudinally of the base, a block mounted on and carried by the knee and having sliding movement on frontface thereof, the blockhaving ratchet teeth on one face thereof extending rearward, a pawl mounted on the knee and resil- V iently urged into engagement with the ratchet teeth and having a handle whereby it may be shifted out of engagement with the teeth, and a lever operatively mounted upon the knee and having operative connection to the block whereby the block may be 'advanced or retracted relative to the knee.

7 2. In a saw m1ll carriage mechanism, a, vbase, a knee shd ngly engaging said base,

power operated means. forlongitudinally shifting the knee, said knee being formed with two upwardly extending side walls,,a block disposed between and slidingly mounted on the'side walls for movement parallel to themovement of the knee, said block extending torthe front face of theknee, the

described including a base, engaging said base, power operated means for shifting the knee, said knee'having its with two upwardly upper: portion ing to the frontsface of the kneerand ward upon the V r,-

be modified in many r I block having; rearwardly facing ratchet a pawl carrying d"teeth on its under face,,.

7 haft extending through the two: walls of 'of shifting the sliding}, block'19, I have illustrated this block as? carry the pawl out :mill carriage ratchet teeth, a lever mounted upon 'oneend of the shaftwwhereby the shaft 'may be rocked to release the pawl from its engagement with the ratchet teeth, and a lever opfera'tively mountedupon the knee and operatively engaging said block 'whereby' the blockmayfbe retracted or'advanced. 7

3. A saw mill mechanism ofthe-character a knee slidingly :formed extending, parallel walls, a block mounted "betweensaidrwalls at the "upper end of. the

frontface;of the knee to a point below-the middle of the knee the he knee beneath the block, a pawl mounted in a direction to carrythe pawl into engagement withthe teeth, a lever on the opposite end of the shaft exteriorly' of the knee whereby the shaft maybe rotated-to V of engagement with the ratchet teeth, and a lever operatively mounted upon the knee and operatively connected to the block. ,r V

4:. The combination with the, knee ofa saw having upwardly extending spaced'walls, one of the walls being shorter than the other wall, of a block disposed the knee parallel to thei knee and extending to the a between the, walls and having 'slidingengagement therewith longitudinally'ofthe carriage, said block extending laterally over the shorter wall and then downward over the outer. face of the wall and extending downward at its forward end'over the front face of the knee, manuallyreleasable means for locking the block against rearward movement relative to the knee, and manually operable means for shifting theblock longitudinally, P

5. The combination with thelongitudinally ing aportion extending over the outer face nee and having longitudinal; sliding en f .gagementi-with'the:walls, said block extenddown- 7 hereon and engageable with the ratchet V w eeth, a spring on one endof the shaft-rock-' ing it of one of said walls and connecting said downwardly extending portion with that portion of the block extending over the top of the wall of the knee, that portion of the block extending over the outside face of the knee being cut away, the under face of the block being formed with rearwardly facing ratchet teeth, a pawl shaft extending through the side walls of the knee and projecting beyond one of said side walls behind the cut away portion of the block, a lever attached to this projecting portion of the pawl shaft, a pawl attached to the pawl shaft and engaging the ratchet teeth of the block,v a spring urging the pawl outward in a direction to carry the pawl into engagement with the ratchet teeth, and manually operable means for longitudinally shifting the block independently of the knee.

In saw mill carriage mechanism, a base formed to provide spaced tracks, a knee having a base portion formed to slide upon said tracks, the base portion having an intermediate portion extending downward into the space between the tracks and screw threaded, a feed screw extending longitudinally through the space between the tracks and en gaging said screw-threaded portion of the base of the knee, said knee having upwardly extending, laterally spaced walls, a block slidably mounted between the upper portions of said walls for longitudinal movement parallel to the movement of the knee, said block extending to the front of the knee and having a portion extending downward over the front of the knee, the under face of the block being provided with rearwardly facing ratchet teeth, a pawl shaft passing through the two walls of the knee between the block, a pawl mounted thereon and engageable with the ratchet teeth, a spring rocking the shaft in a direction to carry said pawls into engagement with the ratchet teeth, a lever on the shaft exterior to one 7 of said walls of the knee whereby the shaft may be rocked to retract the pawl, and a lever operatively pivoted upon the base of the knee, the block having a member extending therefrom and pivotally engaged with said lever.

In testimonywhereof I hereunto affix my signature in the presence of two witnesses.

IRVIN W. JOHNSON. Witnesses:

E. P. DOARE, J. W. LEITCH. 

